title: Effect of aging on quality of nocturnal erections: evaluation with NPTR testing.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D007172:Erectile Dysfunction / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010410:Penile Erection / Q000502:physiology*